# 加法
def add(a,b):
    return a + b

# 减法
def subtract(a,b):
    return a-b

# 计算
def calculator(one_function,a,b):
    result = one_function(a,b)
    print("计算结果:",result)

print(type(add))
aaaa = add

print(aaaa(2,4))

calculator(subtract,5,3)